So i just recently saw the g shock dw5600ms, and fell in love. I then was searching around for the cheapest price (yes, i'm "thrifty") and found there are 4 watches in the MS series! I found there is a 5600, a 6900, a mudman and a frogman. (found here: http://www.jomashop.com/cagmiwase.html) my question is, are any of these better than the other? i.e. more features? Is the frogman really worth it? All i have is a regular 6900 that i use for running and swimming. Want to buy one of these, but dont know which one. any input is appreciated.